Manitowoc Q450 Service Technician's Handbook page 71

Problem: Water Will Not Run into the Sump Trough
During the Freeze Cycle
Step 1. Verify water is supplied to the ice machine,
and then start a new Freeze sequence by moving the
ICE/OFF/CLEAN toggle switch to OFF, then back to
ICE.
This restart must be done prior to performing
diagnostic procedures. This assures the ice machine
is not in a Freeze cycle water inlet valve safety shut-
off mode. You must complete the entire diagnostic
procedure within 6 minutes of starting.
Step 2. Wait until the Freeze cycle starts
(approximately 45 seconds – the Freeze cycle starts
when the compressor energizes), and then refer to the
chart.
Step 2. Checking for Normal Operation
Is Water
Flowing
into the
Water
Trough?
Yes
No
Important
The
Water
Level
Light Is:
Off
On or
Off
De-energized
The Water
Inlet Valve
Solenoid
Coil Is:
Energized
Energized
or
–61–
Cause
This is
normal
operation.
Do not
change any
parts.
Proceed to
step 3.